Our dictionary tells us that the ant is a social insect. That means that ants live in societies in which they depend on one another.

字典中解释蚂蚁是社会性的昆虫，也就是说蚂蚁生活在可以互相依靠的社会中。

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"This simple experiment demonstrates that nest leaving is not caused by parasite manipulation but by the imminence of death, " says biologist Michel Chapuisat of the University of Lausanne, Switzerland, who studies the evolution of insect societies.

BBC: Earth News - Heroic altruistic ants face death alone to save colony